Device for promoting combustion



Dec. 24, 1929. l A, 1 ||-,sm|ME| v 1,740,457

- DEVICE Fon PRoMoTING coMBUs'rIoN Filed April 2o, 192? Figi.-

Patented Dee. Z4, 1929 uiten svg-,1

titan ANTHONY J'. HAMMER, OF ST. LOUIS COUNTY, MISSOURI, ASSIGE'OR TO IENTEENATIONAL SMOKE BURNER CO., OF DOVER, DELAWARE, A CORPORATEON OF DELAWARE DEVICE FOR ROIEOTNG COMBUSTEON Application filed April 20,

materials carried with the gases from the bed of fuel in the furnace.

Another object of the invention is to provide a device of the class described whereby a quantity of air is preheated and supplied in such a manner to the combustion chamber of the furnace as to be mixed with the unburned portion of the fuel that emanates rom the bed of fuel in the combustion cham- Another object of the invention is to provide a device of the class described that may be interposed in the combustion chamber of the furnace or the like, said device having a construction that prevents the same from burning out when subjected to the heat of the combustion chamber.

Additional advantages of the construction will be apparent from the following detailed description thereof, taken in connection with the accompanying drawing, in which Fig. 1 is a vertical section illustrating the device applied to a standard form of tire door.

Fig. 2 is a top plan view of the structure.

Fig. 3 is a front elevation showing the device applied to the fire door.

Fig. 4 is a vertical section through the device showing the internal construction taken substantially on the line lf-a of Fig. 5.

Fig. 5 is a rear elevation of the device.

In the embodiment of the invention illustrated in the drawing the device of the invention is shown as associated with a lire door of standard construction, said door comprising a door member 1 having an air inlet passage 2 that is closed by an air door 3, said air door being arranged with a hinge connection so that it may be manipulated to admit vary- 1927. Serial No. 185,215.

ing quantities of air from the exterior of the furnace, or the face of the door 3 may be provided with a damper of known construction whereby the amount of air admitted may be controlled.

The door 1 is provided with a. marginal flange 4 to which is attached a back plate 5 having a forwardly projecting extension 6. A fire door thus constructed provides for an air passage so that the air admitted through the door 3 passes through the hollow portion of the vertical section of the dor and rearwardly into the compartment formed by the extension 6. lt will be understood that the back wall 7 of the extension 6 has an opening therein over which is attached the device specifically including the invention.

`While the door of the construction above described presents a suitable door construction with which to associate the device of the invention, it will be understood that the device is not limited in its association to a fire door of any particular construction so long as there is provided a means for admission of air and for the passage of air from the exterior of the furnace to the inlet opening of the device of the invention.

r)The device of the invention includes a rectangular frame 8 having any form of connection whereby the frame may be connected directly with the marginal edges of the opening in the iire door, the specilic means illustrated in the drawing comprising the notches 9 in which are seated bolts 10 that enter the back plate 7. The bolts 10 fitting in the notches and fitting into the back plate 7 provide removable means for holding the frame 8 close against the back wall of the fire door in a position so that the opening of the frame 8 registers with the opening in the back plate 7.

Extending forwardly of the frame 8 and integrally connected therewith is a chamber formed from inwardly inclined side walls 11, a bottom wall 12 and a rounded dome-shaped top wall 13. r)The forward portion 14 of the bottom wall 12 and of an extension 15 of the wall 13 form a neck that defines a rectangular outlet opening 16 at the inner end of the device, and the eatension 1f. ile integrally connected with the wall 12, is so formed in relation thereto that there is provided a rectangular opening 17 inwardly disposed from the opening 16. rl`he opening 1G is in a vertical plane and the opening 17 is in a horizontal plane. lThe opening 17 provides for admission to the internal chamber formed in the device of the gases rising from the bed of fuel in the combustion chamber of the furnace, it being understood that, when the lire door is closed, the wall 12 extends into the combustion chamber at an elevation above the bed of fuel in the combustion chamber. The opening 16 provides for the outlet of the air admitted to the interior chamber of the device, which air is mixed with the gases rising from the bed of fuel in such a manner as to form a combustible mixture that burns in the combustion chamber, adding to the heat production and also reducing the amount of unburned carbonaceous material carried off through the stack of the furnace from the combustion chamber thereof. Furthermore, the circulation of air at the outlet end of the chamber of the device prevents overheating of the walls surrounding the openings 16 and 1? and thereby prevents the burn ing out of the walls from the heat in the combustion chamber.

rifhe internal chamber of the device is provided with a series of deflectnig and heat radiating ribs comprising a group of vertically disposed ribs 18 carried by the bottom wall 12 and extending parallel with the line of air draft through the chamber. A rlhe ribs 18 are formed at spaced intervals and are suit ably formed to originate at the frame S and to extend forwardly to a point defined by an edge of the opening 17.

disposed and depenc ing from the inner face of the wall 13. The two series of ribs 18 and 19 have a dual function of breaking up the air draft and gas draft through the chamber and also for radiating heat from the external walls of the device, thereby preventing over-` heating of the device and at the same time extending the heating surface with which the currents of air and gas come in Contact as they progress through the internal chamber.

From the foregoing description of the construction it will be understood that predetermined quantities of air are admitted to the fire door, the air coming from the exterior of the furnace. The air passes through the internal passages of the lire door and into the throat of the internal chamber defined by the frame 8. The heat from the fuel bed in the combustion chamber heats the internal area of the chamber, thereby raising the temperature of the incoming air, the air currents being given a turbulent and dei'iected course by reason of the internal heat that varies in degree from the top to the bottom of the device,

nere is a second group of ribs 19 .similarly and also by the deflecting ribs within the chamber. rifhe gases rising from the bed of fuel in the combustion chamber as is well known carries entrained unburned carbonaceous material which enters the internal chamber through the opening 17 and is there mixed with the currents of heated air that are 'drawn through the outlet opening 16.

rlChe intimate mixture of the carbonaceous material with the expelled air currents, together with the supply of oxygen in a heated condition that passes to the combustion chamber' over the bed of fuel, forms a highly combustible mixture that burns readily to a degree sufhcient to cause combustion of the combustible component of the gas, thereby increasing the heating eh'iciency of the furnace and at the same time reducing the amount of unburned material passing from the combustion chamber through the flue. of the furnace. The device, therefore, acts as a fuel economizer and at the same time serves to eliminate the smoke passing from the furnace.

iin important feature of the construction also is the fact that the device, when subjected to the high temperature of the combustion chamber of the furnace, will not readily burn out but will be durable in use for the reason that the walls of the device are prevented from reaching a deteriorating temperature by reason of the cooling effect of the currents of air and gas passing therethrough and also by reason of the radiation from the walls by reason of the ribs formed within the internal chamber of the device.

l am aware that the invention may be modified in numerous particulars without departing from the spirit and scope thereof. `What 1 claim and desire to secure by Letters Patent is- 1. A device of the class described comprising an air inlet chamber having a horizontal bottom wall and a dome-shaped top wall, a series of spaced ribs arranged on the bottom wall and extending vertically therefrom, a second series of ribs depending from the top wall, said ribs tapering in width from the inlet to the outlet end of said chamber, and a nozzle integrally connected with said chamber including an upwardly flared top wall and said nozzle being provided with an elongated outlet opening at its end, and an elongated inwardly'flaring opening in its bottom wall extending longitudinally with said outlet opening. Y

2. A device of the class described comprising a chamber formed from a substantial horizontal bottom wall, side and top walls converging inwardly to form a restricted outlet from said chamber, and an inwardly extending nozzle formed in integral prolonga tion of the chamber and extending inwardly from said restricted outlet of the chamber,

said nozzle being provided with a vertical outlet opening and said nozzle being further provided with an opening in its bottom wall located inwardly from the restricted outlet of the chamber, said openings in the nozzle being so disposed as to form a passageway for the circulation of hot gases around the lower edge of the vertical outlet opening of the nozzle.

3. A device of the class described comprising a chamber composed of a rectangular frame adapted to be connected with the inner face of a furnace door and to communicate with an air intake exterior of the door, an enclosed compartment extending inwardly from said frame havingwalls thereof converged to form a restricted outlet from the compartment, and an outlet nozzle formed in integral prolongation from the walls of said chamber and extending inwardly therefrom, said nozzle having a vertical Opening at its inner end of a restricted area in respect of the area of the frame, and said nozzle being further provided with a longitudinal opening in the bottom wall thereof in a plane substantially at right angles to the outlet opening, said last named opening being inwardly of the restricted outlet from the chamber and said openings in the nozzle being so arranged as to permit a circulation of gases around the lower edge of the vertical outlet opening from the nozzle to prevent overheating thereof.

e. A device of the class described comprising a chamber composed of a rectangular frame adapted to be connected with the inner face of a furnace door and to communicate with an air intake exterior of the door, an enclosed compartment extending inwardly from said frame having walls thereof converged to form a restricted outlet from the compartment, and an outlet nozzle formed in integral prolongation from the walls of said chamber and extending inwardly therefrom, said nozzle having a vertical opening at its inner end, and said nozzle being further provided with a longitudinal opening in the bottom wall thereof in a plane substantially at right angles to the outlet opening, said last named opening being inwardly of the restricted outlet from the chamber and said openings in the nozzle being so arranged as to permit a circulation of gases around the lower edge of the vertical outlet opening from the nozzle to prevent overheating thereof.

ANTHONY J. HAMMER. 

